Obtained 27 stack frames.
/usr/games/crawl-0.32(_Z17write_stack_traceP8_IO_FILE+0x3e) [0x58e9fa86af5e]: write_stack_trace(_IO_FILE*)
/usr/games/crawl-0.32(_Z20crash_signal_handleri+0x18f) [0x58e9fa86b3cf]: crash_signal_handler(int)
/lib/x86_64-linux-gnu/libc.so.6(+0x42910) [0x7dfd68442910]: 
/usr/games/crawl-0.32(_Z13handle_hangupi+0) [0x58e9fab27c70]: handle_hangup(int)
/lib/x86_64-linux-gnu/libc.so.6(+0x42910) [0x7dfd68442910]: 
/lib/x86_64-linux-gnu/libc.so.6(wait4+0x15) [0x7dfd6850fbf5]: 
/usr/games/crawl-0.32(_Z8call_gdbP8_IO_FILE+0xec) [0x58e9fa86b60c]: call_gdb(_IO_FILE*)
/usr/games/crawl-0.32(_Z13do_crash_dumpv+0x458) [0x58e9fa8790d8]: do_crash_dump()
/usr/games/crawl-0.32(_Z20crash_signal_handleri+0x1fa) [0x58e9fa86b43a]: crash_signal_handler(int)
/lib/x86_64-linux-gnu/libc.so.6(+0x42910) [0x7dfd68442910]: 
/usr/games/crawl-0.32(_ZN5actor9knockbackERKS_iiNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE+0x133) [0x58e9fa7ddb43]: actor::knockback(actor const&, int, int, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >)
/usr/games/crawl-0.32(_ZN4bolt15knockback_actorEP5actori+0xf6) [0x58e9fa81b8c6]: bolt::knockback_actor(actor*, int)
/usr/games/crawl-0.32(_ZN4bolt13affect_playerEv+0x4cf) [0x58e9fa81e53f]: bolt::affect_player()
/usr/games/crawl-0.32(_ZN4bolt11affect_cellEv+0x2d6) [0x58e9fa81f336]: bolt::affect_cell()
/usr/games/crawl-0.32(_ZN4bolt7do_fireEv+0x750) [0x58e9fa826ff0]: bolt::do_fire()
/usr/games/crawl-0.32(_ZN4bolt4fireEv+0x278) [0x58e9fa8279e8]: bolt::fire()
/usr/games/crawl-0.32(_Z16handle_mon_spellP7monster+0x974) [0x58e9fac12cd4]: handle_mon_spell(monster*)
/usr/games/crawl-0.32(+0x804dcd) [0x58e9fabd7dcd]: 
/usr/games/crawl-0.32(_Z19handle_monster_moveP7monster+0x4e6) [0x58e9fabdc536]: handle_monster_move(monster*)
/usr/games/crawl-0.32(_Z15handle_monstersb+0xcf8) [0x58e9fabdf458]: handle_monsters(bool)
/usr/games/crawl-0.32(_Z12world_reactsv+0x14f) [0x58e9fafd20df]: world_reacts()
/usr/games/crawl-0.32(+0xc01436) [0x58e9fafd4436]: 
/usr/games/crawl-0.32(+0xc02135) [0x58e9fafd5135]: 
/usr/games/crawl-0.32(main+0x1f7) [0x58e9fa7a4f47]: 
/lib/x86_64-linux-gnu/libc.so.6(+0x280d0) [0x7dfd684280d0]: 
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0x89) [0x7dfd68428189]: 
/usr/games/crawl-0.32(_start+0x25) [0x58e9fa7a5965]: